The subsequent problems deal with the circuit below where all voltage sources are dc and the circuit is assumed to be in steady state. Also, R1 = R2 = R3 = R4 = R.I3 =

A. (V1 + V2 ? V3) / R
B. (?V2 + V3) / R
C. V2 / R
D. (V1 ? V2 + V3) / R
E. (V2 ? V3) / R


Answer: D

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